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    • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Stellar_Atmospheres_(Tatum)/09%3A_Oscillator_Strengths_and_Related_Topics/9.06%3A_LS-coupling
      The lines in which J does not change are weaker (“satellite” lines), and the lines in which the change in J is in the opposite sense to the change in L are the weakest (“second satellites”...The lines in which J does not change are weaker (“satellite” lines), and the lines in which the change in J is in the opposite sense to the change in L are the weakest (“second satellites”). It was mentioned in Chapter 7 that one of the tests for LS-coupling was Hund’s interval rule, which governs the spacings of the levels within a term, and hence the wavelength spacings of the lines within a multiplet.

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